KR100479456B1 - Waterproof underground power cable applications - Google Patents
Waterproof underground power cable applications Download PDFInfo
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- KR100479456B1 KR100479456B1 KR10-2002-0067063A KR20020067063A KR100479456B1 KR 100479456 B1 KR100479456 B1 KR 100479456B1 KR 20020067063 A KR20020067063 A KR 20020067063A KR 100479456 B1 KR100479456 B1 KR 100479456B1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/28—Protection against damage caused by moisture, corrosion, chemical attack or weather
- H01B7/282—Preventing penetration of fluid, e.g. water or humidity, into conductor or cable
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/02—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of metals or alloys
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
- H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
- H01B3/307—Other macromolecular compounds
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
- H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
- H01B3/44—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/02—Disposition of insulation
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B9/00—Power cables
- H01B9/02—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients
Abstract
본 발명은 수분침투 억제용 지중 전력케이블에 관한 것으로, 중심으로부터 수밀 컴파운드 충진 원형압축 연동연선의 수밀구조를 갖는 도체(1)와, 반도전 열경화성 고순도 컴파운드 재질인 내부반도전층(2)과, 가교폴리에틸렌 컴파운드 재질의 절연층(3)과, 반도전 열경화성 고순도 컴파운드 재질의 외부반도전층(4)과, 반도전성 부풀음 테이프인 중성선수밀층(5)과, 연동선 (encapsulating)인 중성선(6)과, 부풀음 테이프인 중성선수밀층(7)과, 금속 재질의 라미네이트 테이프 형태의 차수층(10) 그리고 PVC 또는 폴리에틸렌 재질의 외피(8)를 포함하여 구성됨으로써, 종래기술에 의한 전력케이블보다 수분침투 억제성능이 크게 개선되었음은 물론 이를 지중 전력케이블에 적용할 경우 수분침투에 의한 수트리 고장을 억제할 수 있으며 또한 수분과 관련된 열화현상을 현저하게 감소시킬 수 있기 때문에 전력케이블을 기대수명까지 사용할 수 있는 특징이 있다.The present invention relates to an underground power cable for moisture penetration suppression, comprising: a conductor (1) having a watertight structure of a watertight compound-filled circular compression interlocked strand from the center, an internal semiconducting layer (2) which is a semiconducting thermosetting high purity compound material, and crosslinking An insulating layer (3) made of polyethylene compound, an outer semiconducting layer (4) of semiconducting thermosetting high purity compound, a neutral pneumatic layer (5), a semiconductive swelling tape, a neutral wire (6), encapsulating , Comprising a neutral protruding layer (7) that is a swelling tape, an order layer (10) in the form of a laminate tape made of metal, and an outer sheath (8) made of PVC or polyethylene, thereby preventing moisture penetration. Not only has this been significantly improved, but when it is applied to underground power cables, tree tree failures caused by moisture infiltration can be suppressed and water-related deterioration Because it can significantly reduce it features available for power cables up to life expectancy.
Description
본 발명은 수분침투 억제용 지중 전력케이블에 관한 것이다.The present invention relates to an underground power cable for preventing moisture penetration.
특히, 본 발명은 고전압 지중 배전케이블에서 수분침투와 관련된 고장을 감소시키도록 외피와 중성선수밀층 사이에 AL 박판계의 차수층을 개재하거나 캡슐형 구조를 이용한 수분침투 억제용 지중 전력케이블에 관한 것이다.In particular, the present invention relates to an underground power cable for inhibiting water penetration using an AL sheet-based layer or an encapsulated structure between an outer shell and a neutral airtight layer so as to reduce the failure associated with water penetration in a high voltage underground distribution cable.
도 1에 나타나 있는 바와 같이, 현재 사용되고 있는 지중 전력케이블은 외부로부터의 수분침투를 방지하기 위하여 내부 도체(1)를 수밀컴파운드로 채우고 있으며, 외피 하단에 소위 부풀음 테이프라는 수팽창 테이프를 사용하고 있다. 또한, 외피 재료로서는 폴리염화비닐(PVC)를 적용한다.As shown in FIG. 1, the underground power cable currently used is filled with a watertight compound for the inner conductor 1 to prevent water penetration from the outside, and uses a so-called inflation tape called a swelling tape at the bottom of the outer shell. . In addition, polyvinyl chloride (PVC) is applied as an outer material.
여기서, 도 1을 참조하여 종래기술에 의한 지중 전력케이블의 단면구조를 좀 더 상세히 설명하면, 중심으로부터 수밀 컴파운드 충진 원형압축 연동연선의 수밀구조를 갖는 도체(1), 흑색 반도전 열경화성 고순도 컴파운드 재질인 내부반도전층(2), 두께가 6.6mm인 가교폴리에틸렌 컴파운드 재질의 절연층(3), 흑색 반도전 열경화성 고순도 컴파운드 재질의 외부반도전층(4), 반도전성 부풀음 테이프인 중성선수밀층 (5), 연동선인 중성선(6), 부풀음 테이프인 중성선수밀층(7) 그리고 흑색 PVC 재질의 외피(8)로 이루어져 있다.Here, the cross-sectional structure of the underground power cable according to the prior art with reference to Figure 1 in more detail, the conductor (1) having a water-tight structure of watertight compound-filled circular compression interlocked strand from the center, black semiconducting thermosetting high purity compound material Phosphorus inner semiconducting layer (2), insulating layer of crosslinked polyethylene compound of 6.6 mm thickness (3), outer semiconducting layer of black semiconducting thermosetting high purity compound material (4), and neutral precursor layer of semiconductive swelling tape (5) It consists of a neutral wire (6) that is an interlocking line, a neutral pneumatic layer (7) that is a swelling tape, and a black PVC sheath (8).
국내에서 발생되고 있는 지중 전력케이블의 주요 고장원인은 수분침투에 의해 야기되는 수트리(water tree)이다. 이러한 수트리는 케이블에 침투한 수분과 전계의 복합작용으로 인하여 발생된다고 알려져 있으며, 일단 수트리가 발생하면 전계집중을 유발하여 고장을 유발하게 된다(참고문헌: M.T.Shaw and S.H.Shaw, Water Treeing in Solid Dielectrics, IEEE Trans. EI, Vol.23, No.6, p.419, 1993).The main cause of underground power cables occurring in Korea is water tree caused by moisture penetration. This tree is known to be caused by the combined action of water and electric field infiltrating the cable, and once the tree is generated, it causes electric field concentration and causes a breakdown (Reference: MTShaw and SHShaw, Water Treeing in Solid) Dielectrics, IEEE Trans.EI, Vol. 23, No. 6, p. 419, 1993).
기존 전력케이블의 외피 재료인 폴리염화비닐은 화학구조 특성상 분자내에 극성기를 갖고 있기 때문에 수분 흡습이 용이하게 일어나며, 부풀음 테이프만으로는 수분침투를 근본적으로 억제하기는 곤란하다(참고문헌: G.Graham and S.Szaniszlo, Insulating and Semiconductive Jackets for Medium and High Voltage Underground Power Cable Applications, IEEE Trans. EI magazine, Vol.11, p.5, 1995).Polyvinyl chloride, the outer shell material of the existing power cable, has a polar group in the molecule due to its chemical structure, so that moisture absorption easily occurs, and it is difficult to fundamentally suppress water penetration by using a swelling tape alone (Ref. G. Graham and S) Szaniszlo, Insulating and Semiconductive Jackets for Medium and High Voltage Underground Power Cable Applications, IEEE Trans.EI magazine, Vol. 11, p. 5, 1995).
상기와 같은 문제점을 해소하기 위하여 창출된 본 발명의 목적은, 지중 전력케이블에서 가장 문제가 되고 있는 수분 침투를 원천적으로 억제하기 위한 수분침투 억제용 지중 전력케이블를 제공함에 있다.SUMMARY OF THE INVENTION An object of the present invention created to solve the above problems is to provide an underground power cable for inhibiting moisture penetration to fundamentally suppress water penetration, which is the most problematic problem in underground power cables.
이러한 본 발명의 목적은, 중심으로부터 수밀 컴파운드 충진 원형압축 연동연선의 수밀구조를 갖는 도체와, 반도전 열경화성 고순도 컴파운드 재질인 내부반도전층과, 가교폴리에틸렌 컴파운드 재질의 절연층과, 반도전 열경화성 고순도 컴파운드 재질의 외부반도전층과, 반도전성 부풀음 테이프인 중성선수밀층과, 연동선 (encapsulating)인 중성선과, 부풀음 테이프인 중성선수밀층과, 금속 재질의 라미네이트 테이프 형태의 차수층 그리고 PVC 또는 폴리에틸렌 재질의 외피를 포함하여 구성된 것을 특징으로 하는 수분침투 억제용 지중 전력케이블에 의해 달성될 수 있다.The object of the present invention is a conductor having a watertight structure of watertight compound-filled circular compression interlocked strand from the center, an internal semiconducting layer made of a semiconductive thermosetting high purity compound material, an insulating layer made of a crosslinked polyethylene compound material, and a semiconducting thermosetting high purity compound. The outer semiconducting layer of material, the neutral thick layer of semiconductive swelling tape, the neutral line of encapsulating, the neutral thick layer of swelling tape, the order layer in the form of a laminate tape of metal, and the outer shell of PVC or polyethylene It can be achieved by the underground power cable for moisture penetration inhibition, characterized in that configured to include.
여기서, 본 발명의 차수층은 알루미늄(Al) 또는 구리(Cu) 재질이 바람직하다. Here, the order layer of the present invention is preferably aluminum (Al) or copper (Cu).
또한, 이러한 본 발명의 목적은, 중심으로부터 수밀 컴파운드 충진 원형압축 연동연선의 수밀구조를 갖는 도체와, 반도전 열경화성 고순도 컴파운드 재질인 내부반도전층과, 가교폴리에틸렌 컴파운드 재질의 절연층과, 반도전 열경화성 고순도 컴파운드 재질의 외부반도전층과, 연동선(encapsulating)인 중성선 그리고, PVC 또는 폴리에틸렌 재질의 외피를 포함하여 구성된 것을 특징으로 하는 수분침투 억제용 지중 전력케이블에 의해 달성될 수 있다.In addition, the object of the present invention is a conductor having a watertight structure of watertight compound-filled circular compression interlocked strand from the center, an internal semiconducting layer of semiconducting thermosetting high purity compound material, an insulating layer of crosslinked polyethylene compound material, and semiconducting thermosetting It can be achieved by an underground power cable for inhibiting moisture penetration, characterized in that it comprises an outer semiconducting layer of high purity compound material, a neutral wire that is encapsulating, and a sheath of PVC or polyethylene.
이하, 도면을 참조하여 본 발명의 구성을 상세히 설명하면 다음과 같다.Hereinafter, the configuration of the present invention with reference to the drawings in detail.
도 2를 참조하여 본 발명의 일실시예에 의한 금속 라미네이트 구조의 지중 전력케이블을 설명하면, 지중 전력케이블은 지중 전력케이블의 외피(8) 하단에 금속성(알루미늄 (Al))의 라미네이트 차수층(10)을 추가한 것이다. 이러한 금속 라미네이트의 역할은 외피재료를 통해 흡수되는 수분침투를 억제하는 것이다. 금속 라미네이션(Al 또는 Cu)는 테이프 형태의 금속막으로써, 금속 라미네이트의 한쪽 면은 열에 의해 서로 접착할 수 있도록 접착제가 코팅되어 있다.Referring to Figure 2 describes the underground power cable of the metal laminate structure according to an embodiment of the present invention, the underground power cable is a laminate order layer 10 of a metallic (aluminum (Al)) to the bottom of the outer shell 8 of the underground power cable ) Is added. The role of these metal laminates is to inhibit moisture penetration through the skin material. Metal lamination (Al or Cu) is a metal film in the form of a tape, and one side of the metal laminate is coated with an adhesive so as to be bonded to each other by heat.
이상의 본 발명의 금속 라미네이트 구조의 지중 전력케이블의 단면구조를 좀 더 상세히 설명하면, 본 발명의 전력케이블은 중심으로부터 수밀 컴파운드 충진 원형압축 연동연선의 수밀구조를 갖는 도체(1), 흑색 반도전 열경화성 고순도 컴파운드 재질인 내부반도전층(2), 두께가 6.6mm인 가교폴리에틸렌 컴파운드 재질의 절연층(3), 흑색 반도전 열경화성 고순도 컴파운드 재질의 외부반도전층(4), 반도전성 부풀음 테이프인 중성선수밀층(5), 연동선(encapsulating)인 중성선(6), 부풀음 테이프인 중성선수밀층(7), Al 재질의 라미네이트 테이프 형태의 차수층(10) 그리고 흑색 PVC 또는 폴리에틸렌 재질의 두께가 3~4mm인 외피(8)이다When the cross-sectional structure of the underground power cable of the metal laminate structure of the present invention will be described in more detail, the power cable of the present invention is a conductor (1) having a watertight structure of a watertight compound-filled circular compression interlocking strand from the center, black semiconducting thermosetting Internal semiconducting layer (2) of high purity compound material, insulating layer (3) of crosslinked polyethylene compound material of 6.6 mm thickness, outer semiconducting layer (4) of black semiconducting thermosetting high purity compound material, and neutral prone layer of semiconductive swelling tape (5), a neutral wire (6) encapsulating, a neutral pneumatic layer (7), a swelling tape, an order layer (10) in the form of a laminate tape of Al, and a sheath of 3-4 mm thick of black PVC or polyethylene (8)
한편, 도 3을 참조하여 본 발명의 다른 실시예에 의한 캡슐 구조의 지중 전력케이블을 설명하면, 지중 전력케이블은 외피(8) 재료의 자체 내부에 중성선(6)이 포함되어 구성된다. 이러한 이유는 중성선(6)이 외피(8)에 의해 보호되기 때문에 수분침투에 의한 부식이 최소화될 수 있으며, 또한 절연층(3)과도 밀착되기 때문에 케이블 방향, 예컨대 도체 방향으로의 수분침투가 억제될 수 있다.Meanwhile, referring to FIG. 3, the underground power cable having a capsule structure according to another embodiment of the present invention will be described. The underground power cable includes a neutral wire 6 inside the shell 8 material itself. This is because the neutral wire 6 is protected by the sheath 8, so that corrosion due to moisture penetration can be minimized, and because it is also in close contact with the insulating layer 3, moisture penetration into the cable direction, for example, conductor direction, is suppressed. Can be.
이상의 본 발명의 캡슐형 구조의 지중 전력케이블의 단면구조를 좀 더 상세히 설명하면, 본 발명의 전력케이블은 중심으로부터 수밀 컴파운드 충진 원형압축 연동연선의 수밀구조를 갖는 도체(1), 흑색 반도전 열경화성 고순도 컴파운드 재질인 내부반도전층(2), 두께가 6.6mm인 가교폴리에틸렌 컴파운드 재질의 절연층(3), 흑색 반도전 열경화성 고순도 컴파운드 재질의 외부반도전층(4), 연동선 (encapsulating)인 중성선(6) 그리고, 흑색 PVC 또는 폴리에틸렌 재질의 두께가 3~4mm인 충실 외피(8)이다When explaining the cross-sectional structure of the underground power cable of the capsule structure of the present invention in more detail, the power cable of the present invention is a conductor (1) having a watertight structure of a watertight compound-filled circular compression interlocking line from the center, black semiconducting thermosetting Internal semiconducting layer (2) of high purity compound, insulating layer (3) of crosslinked polyethylene compound material of 6.6mm thickness, outer semiconducting layer (4) of black semiconducting thermosetting high purity compound, neutral wire (encapsulating) 6) and a solid outer shell 8 having a thickness of 3-4 mm of black PVC or polyethylene material.
전술된 2가지 형태의 지중 전력케이블은 외피 재료를 PVC가 아닌 폴리에틸렌으로 사용할 경우에는 수분침투 억제능력을 더욱 더 향상시킬 수 있다.The above-mentioned two types of underground power cables can further improve the moisture permeation suppression ability when the outer material is polyethylene instead of PVC.
이상에서 설명된 본 발명은 설명된 실시예들에 한정되어 설명되었지만, 이에 한정되지 않고 본 발명이 속하는 분야의 통상적인 기술분야에서 통상의 지식을 가진 자가 용이하게 실시할 수 있는 정도의 변형은 본 발명의 기술적 사상에 속하는 것임은 자명하다.Although the present invention described above is limited to the described embodiments, the present invention is not limited thereto, and the present invention may be easily modified by those skilled in the art. Obviously, it belongs to the technical idea of the invention.
- 실시예 1 내지 3, 비교예 1 -Examples 1 to 3 and Comparative Example 1
하기되는 표 1과 같은 구조로 지중 전력케이블을 제조하였다. 이 때의 도체의 단면적 크기는 325mm2이며, 실제의 전력케이블 생산용 압출시스템을 사용하였다. 제조한 전력케이블의 구조에 대해 설명하면 다음과 같다.The underground power cable was manufactured in the structure shown in Table 1 below. At this time, the cross-sectional area of the conductor was 325 mm 2 , and an actual power cable extrusion system was used. The structure of the manufactured power cable is as follows.
※ 표에서 "◎"은 사용했음을 의미하고, "X"는 사용하지 않음을 의미함.※ In the table, "◎" means used, and "X" means not used.
비교예 1은 종래기술에 의한 지중 전력케이블이며 외피재료는 폴리염화비닐이다. 실시예 1은 금속 라미네이트(0.3mm의 알루미늄 박막)를 추가한 구조이며, 외피재료는 폴리염화비닐을 사용하였다. 실시예 2는 캡슐형 구조로서 폴리염화비닐로 된 외피 내부에 중성선을 포함시켰다. 실시예 3은 종래기술에 의한 지중 전력케이블과 동일한 구조이지만 외피재료로 폴리에틸렌(선형 저밀도 폴리에틸렌)을 적용하였다.Comparative Example 1 is an underground power cable according to the prior art, and the outer material is polyvinyl chloride. Example 1 has a structure in which a metal laminate (0.3 mm aluminum thin film) is added, and the outer skin material is polyvinyl chloride. Example 2 included a neutral wire inside a polyvinyl chloride shell as a capsule structure. Example 3 is the same structure as the underground power cable according to the prior art, but the polyethylene (linear low density polyethylene) was applied as the shell material.
이렇게 제조한 전력케이블에 대해 수분침투 특성을 평가하였다. 평가방법으로는 실제 케이블에 대한 수분침투시험 규격인 일본 동경전력(TEPCO)의 방법을 적용하였다. 이 시험방법은 완제품 케이블에서 약 0.3m 정도의 코어를 제거한 다음 실린더 형태의 외피 내부에 실리카겔 100g을 채운다. 이러한 시료를 60℃의 물에 침수하여 10일, 20일, 30일의 중량 변화를 측정한다. 아래의 수학식을 사용하여 투습도를 계산하였다.The moisture permeation characteristics of the power cables thus manufactured were evaluated. As an evaluation method, the method of Japan Electric Power Co., Ltd. (TEPCO), which is a water penetration test standard for actual cables, was applied. This test method removes about 0.3 m of core from the finished cable and fills 100 g of silica gel inside the cylindrical sheath. This sample is immersed in water at 60 ° C. to measure the weight change of 10 days, 20 days, and 30 days. The moisture permeability was calculated using the following equation.
여기에서, Q는 투과수분량(g), L은 시료길이(cm), R1은 외피 내경(cm), R2는 외피 외경(cm), d는 시험온도에 따른 포화수증기압(mmHg, 60℃의 경우 149.5mmHg), t는 시험시간(day)이다. 따라서, 단위는 gㆍcm/cm2ㆍdayㆍmmHg이다. 평가결과는 표 2와 같다.Here, Q is the amount of permeated water (g), L is the sample length (cm), R 1 is the outer diameter (cm), R 2 is the outer diameter (cm), d is the saturated water vapor pressure (mmHg, 60 ℃) according to the test temperature For 149.5mmHg), t is the test time (day). Accordingly, the unit is g · cm / cm 2 · day · mmHg. The evaluation results are shown in Table 2.
표 2에 나타나 있는 바와 같이, 실시예에서 측정된 투습도의 정도가 비교예 1에 비하여 상대적으로 낮은 값을 나타내는 것을 알 수 있다. 금속 라미네이트를 사용한 구조에서 매우 우수한 수분억제 효과가 나타났으며, 캡슐형 구조와 외피재료를 변경한 경우에도 수분침투가 크게 억제됨을 알 수 있었다.As shown in Table 2, it can be seen that the degree of moisture permeability measured in the Example shows a relatively low value compared to Comparative Example 1. The structure using the metal laminate showed a very good water suppression effect, and it was found that the moisture penetration was greatly suppressed even when the capsule-type structure and the skin material were changed.
이상의 구성을 갖는 본 발명은 종래기술에 의한 전력케이블보다 수분침투 억제성능이 크게 개선되었음은 물론 이를 지중 전력케이블에 적용할 경우 수분침투에 의한 수트리 고장을 억제할 수 있으며 또한 수분과 관련된 열화현상을 현저하게 감소시킬 수 있기 때문에 전력케이블을 기대수명까지 사용할 수 있도록 하는 이점(利點)이 있다.The present invention having the above configuration has significantly improved the moisture permeation suppression performance than the power cable according to the prior art, and when applied to the underground power cable, it is possible to suppress tree tree failure due to moisture infiltration and deterioration related to water. Since it can significantly reduce the power consumption, there is an advantage in that the power cable can be used up to the life expectancy.
도 1은 종래기술에 의한 지중 케이블을 나타내는 단면도이다.1 is a cross-sectional view showing an underground cable according to the prior art.
도 2는 본 발명의 일실시예에 의한 금속 라미네이트 구조를 갖는 수분침투 억제용 지중 전력케이블을 나타내는 단면도이다.2 is a cross-sectional view showing the underground power cable for moisture penetration suppression having a metal laminate structure according to an embodiment of the present invention.
도 3은 본 발명의 다른 실시예에 의한 캡슐형 구조의 지중 전력케이블의 단면도이다.3 is a cross-sectional view of the underground power cable of the capsule structure according to another embodiment of the present invention.
<< 도면의 주요부분에 대한 부호의 설명 >><< Explanation of symbols for main part of drawing >>
1 : 도체 2 : 내부반도전층1: conductor 2: inner semiconducting layer
3 : 절열층 4 : 외부반도전층3: heat insulation layer 4: outer semiconducting layer
5 : 중성선수밀층 6 : 중성선5: Neutral bowels layer 6: Neutral ship
7 : 중성선수밀층 8 : 차수층7: Neutral prosthetic layer 8: Order layer
9 : 외피 10 : 충실외피9: outer shell 10: faithful outer shell
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